e2e: use hermes master docker image

[crodriguezvega]

Description

As requested by Romain to test the fix for informalsystems/hermes#3580 works fine.

closes: #XXXX

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[damiannolan]

Awesome, thank you @crodriguezvega and @romac for the new image!
Do we want to merge this as is or keep it open until a release version is available?

[crodriguezvega]

Do we want to merge this as is or keep it open until a release version is available?

I am fine merging it as is and update when v1.7 is available.

[colin-axner]

Only concern with using master is having e2e's fail suddenly, benefit of using a tag is that you don't have to worry about debugging recent changes

[damiannolan]

reACK